Deleted testSporadicWrites IndexedDB performance test.

tools/perf/benchmarks/indexeddb_perf.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Runs Chromium's IndexedDB performance test. These test:
 
 Databases:
   create/delete
 Keys:
   create/delete
 Indexes:
   create/delete
 Data access:
   Random read/write
-  Sporadic writes
   Read cache
 Cursors:
   Read & random writes
   Walking multiple
   Seeking.
 """
 
 import json
 import os
 
@@ skipping 59 matching lines @@
 class IndexedDb(test.Test):
   """Chromium's IndexedDB Performance tests."""
   test = _IndexedDbMeasurement
 
   def CreatePageSet(self, options):
     indexeddb_dir = os.path.join(util.GetChromiumSrcDir(), 'chrome', 'test',
                                  'data', 'indexeddb')
     ps = page_set.PageSet(file_path=indexeddb_dir)
     ps.AddPageWithDefaultRunNavigate('file://perf_test.html')
     return ps